get it straight!
I made this page not because I dislike link exchange banners, or advertising ads, but because I dislike the way they are *used*. Really, though, having 3 ads and 2 banners on your page is not a smart thing to do.
I'm not clicking that thing!
When I go to a page and see three advertising banners at the top, I just sigh to myself. But when I see three ads at the top, and the only other things I see are "Help out! Click me!", or "CLICK THIS NOW!", I just want to beat my head on the wall. Actually, I will not click on those advertisements on sites that beg people to do it. Why should I? If you want people to click on them, just put them on your page. Maybe say something like "Please click to help this page out!", but don't demand or bug us to death.
my limitations
When placing exchange banners and ads on your page, try to limit yourself to only one of each. Maybe you can get away with putting 2 of one, and 1 of the other on a page, but don't do it on all pages. Also, only try to join one advertising network and up to two link exchanges. After all, why do you need to be a member of 10 different networks?
putting the banners up
Now, this is the major downfall of all banners. When I go to a webpage, I want to see what it has to offer me. Sometimes, all I see are 3 banners and ads at the top of the page. The point is, I don't want to go through all your banners and ads just to read some text. If I were you, I would put my advertisement banner at the very top, so everyone sees it, and the link exchange banners at the very bottom.
now, the real choice
So, since you have decided to put up one ad, and one link exchange banner, which two networks should you join? Well, I strongly urge you to join BURST! Media, and the Link Exchange. These are the most popular networks to join, and will usually have the best results.